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Scheduled Maturities of Contractual Debt Obligations (Detail)
$ in Thousands
Jun. 30, 2018
USD ($)
Debt Instrument [Line Items]  
2018 (for the remaining six months) $ 43,750
2019 87,500
2020 87,500
2021 87,500
2022 1,297,738
Thereafter $ 513,662